Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e94213903f28240…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 03:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: baf7852237f87a04de82a25fd9c18d00 SHA-1: b1de01ae9658978d71dbefb7fd964f3a6a821042 SHA-256: 1e94213903f28240e1d581840280d66e45d58d05e396297ef75d67755e2c64a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=introduction+to+time+series+analysis+and+forecasting+montgomery+pdf PDF link annotation
    • http://studioarchterreni.it/userfiles/files/sivituguzalowulonilij.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/73425684631.pdfIn PDF document text
    • http://zuche0551.com/upload/file/fosagamape.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/65139664636.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/agk8kdigi6t4vg6m78fnd32slj/midabifazefilofasevipak.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/52150550714.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/92433895929.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/75108455924.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/pajupaneg.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/xokofamusaselotogiv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e3d74c1127e4b07fbdd0a7ba920b2a80/xosesajofiragu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402fa751088---87351677837.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/bosekovawewakafenanurune.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/64864636714.pdfIn PDF document text
    • http://sireny.net/share/files/16952314445.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/zuliletebedalamib.pdfIn PDF document text
    • http://coachhouse.info/assets/file/31036216559.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/sorumikal.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/61254942839.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/putixefawodipem.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d52873c3b879ac2f70f72bd44987e490/93438866453.pdfIn PDF document text
    • http://mp-journal.com/media/file/wogokivu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/zuxekaveko.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/kupemugisopuk.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/50018335714.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 11128 bytes
SHA-256: 4cc2e7be328e3f2c3bc1c56fd6851cab3c032d6d5dc6d975ff6ea0276893028f
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 18436 bytes
SHA-256: a02360fe5242fc160869a11dbda22eeacc1a21a11758690f87fc6c030e6e930b
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1